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What conditions restrict the suitable wavelength range for communication with extraterrestrial ...

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What conditions restrict the suitable wavelength range for communication with extraterrestrial ...

What conditions restrict the suitable wavelength range for communication with extraterrestrial intelligence to the “water hole” in the high-frequency radio range of the electromagnetic spectrum (see Fig. 19-5 of Kaufmann and Comins, Discovering the Universe, 7th Ed.)?
A)   Cosmic background radio noise at low frequencies and radio noise from the Sun and Jupiter at high frequencies
B)   Local radio noise from TV, radio, and aircraft across the band, except a narrow range in which transmission is prohibited by international agreement in order to permit such extraterrestrial communication
C)   Atmospheric absorption by the ionosphere at low frequencies and by CO2 at high frequencies in the long infrared range
D)   High galactic radio background noise at low frequencies and high atmospheric absorption by H2O and O2 at high frequencies, with a suitable region in between

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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symbo Author

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7 years ago

Good timing, thanks!

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Smart ... Thanks!

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